An object moves through air at a speed so high that the air itself cannot slide out of the path of the object. As this air piles up it compresses more and more, increasing in pressure quickly, and forming a shock-wave of air to all sides of the object in a cone. The air being so compressed holds itself in a cone, losing energy gradually. As the highly compressed air passes over a point the pressure spikes UP and then back DOWN to ambient in very little time, and that spike is experienced as a BOOM.
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